The Board of Aldermen has approved a $2.4 million bond to improve security at the city’s elementary and middle schools. If approved by voters, the bond will finance alarms and monitors at the entrances to the city’s 12 elementary and three middle schools. The system will include 100 cameras with a central monitoring system and a buzz-in intercom system at the main entrances of each school. A public hearing on the system will be held at City Hall on Jan. 17 at 7 p.m.